The induction of the first A321neo, of the 150 on order, will help IndiGo spread its wings to medium-haul international destinations.
Flights of up to six hours duration come under medium- long haul category of operations.
IndiGo now has 204 planes in its fleet, including one A321neo, 65 A320neos, 126 A320ceos (current engine option), and 12 ATRs, the source said.
The longer range A321neo plane has been delivered to the airline at a time when it is struggling with the frequent glitches in the Pratt & Whitney engines, powering these planes, and taking these aircraft out of operations on a regular basis.
These engine-run aircraft have been facing glitches frequently since their induction in the fleet by IndiGo and GoAir in 2016, with several instances of mid-air engine shut downs.
But the US engine maker has failed to come up with any tangible solution to fix these glitches so far despite frequent grounding of these planes and passengers' safety at risk.
The airline has already announced its plans to launch services to Istanbul and has also signed a code-share pact with the Turkish Airlines for seamless connectivity to 20 global destinations for its passengers from Istanbul and onwards.
In turn, passengers of the Turkish national carrier will have access to all destinations operated by IndiGo within India.
IndiGo at present operates over 1,300 daily flights to 52 domestic and 15 international destinations.
The airline had in two tranches placed an order for 430 A320neos (180 in 2011 and 250 in 2015) with Airbus. Later, it converted 150 of these 430 planes to A321neos.
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